Hobart Q Series manual CONTROLS Safe-T-Thaw Only

STANDARD THERMOMETER (Fig. 9) — The standard digital thermometer is calibrated at the factory and does not permit recalibration.

OPTIONAL DIAL THERMOMETER — The optional dial thermometer can be recalibrated. Compare the cabinet thermometer with an accurate test thermometer. If there is any variation, contact a Hobart-authorized Refrigeration Service Company.

CONTROLS (Safe-T-Thaw Only)

PL-50767

Fig. 9

The optional Safe-T-Thaw adaptation of the two- or three- section reach-in refrigerators significantly reduces the defrost time of all frozen foods under a controlled environment without employing temperatures over 45°F.

Safe-T-Thaw incorporates a two stage thermostat, a reversing valve on the refrigerant line, and multiple fan units for increased internal air circulation. When non-frozen food is placed in the Safe-T-Thaw unit, it operates as a normal refrigerator — the thermostat switches cooling on at 40°F and off at 36°F. When a sufficient load of frozen food is placed in the cabinet to lower the temperature to 33°F, the heating mode is activated. The two stage thermostat will switch the circulating fans on and reverse the refrigerant valve so the warm refrigerant flows to the inside of the cabinet and the cool refrigerant goes to the outside coil. When the cabinet has warmed to 40°F the thermostat turns off the warming. The cabinet continues to cycle heat on at 36°F and off at 40°F.

When the frozen product has lost its ability to reduce the cabinet temperature to 36°F, heat from the fan motors will gradually cause the cabinet temperature to climb to 45°F. At this point the thermostat will reverse mode again to normal refrigeration cycle — cooling on at 40°F and off at 36°F.

Circulating fans do not work during normal refrigeration mode. All the apparatus works automatically without adjusting the factory settings.

NOTE: To reduce the drying effect of the fans blowing air over foods, it is recommended that food stored in the Safe-T-Thaw be covered.

CONTROLS (Hot Food Storage Units, Fig. 10)
The ON-OFF switch contains a pilot light which glows
whenever the switch is ON. Turn the switch OFF
whenever the cabinet is not in use. The ON-OFF
switch is not a disconnect switch — ALWAYS
DISCONNECT POWER AT THE SOURCE TO
SERVICE THE UNIT. The temperature control dial,
which has a marked OFF position (no heat), is used to
select the temperature at which the food will be held.
When this dial is OFF, the air circulating fans continue
to run.
The HUMIDITY control dial is used to regulate the
humidity level inside the cabinet. Three-section	Fig. 10
cabinets have two HUMIDITY control dials.

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